update CI badge

README.md

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 # pyceo
-[![Build Status](https://ci.csclub.uwaterloo.ca/api/badges/public/pyceo/status.svg)](https://ci.csclub.uwaterloo.ca/public/pyceo)
+[![Build Status](https://ci.csclub.uwaterloo.ca/api/badges/public/pyceo/status.svg?ref=refs/heads/v1)](https://ci.csclub.uwaterloo.ca/public/pyceo)
 
 CEO (**C**SC **E**lectronic **O**ffice) is the tool used by CSC to manage
 club accounts and memberships. See [architecture.md](architecture.md) for an